Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8cf923a783fe87d…

MALICIOUS

PDF

40.0 KB Created: 2020-11-06 19:00:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-15
MD5: 73ffb20bfe21c90530c3357aa7eda298 SHA-1: 84dca979d9c7cc3cba38f9bc3b54825012874164 SHA-256: e8cf923a783fe87d166f123fe6a61b3c97048a2d6eddbc849ce5b63ad7df5035
134 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cctraff.ru/aws?keyword=valu+guide+clips In PDF document text
    • https://katolafafesol.weebly.com/uploads/1/3/4/4/134479470/5d4de7093.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407749/normal_5f9a1311b22ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368772/normal_5f9b58fec541b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447084/normal_5fa0aca4481a6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5f916216868c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368958/normal_5f895807b607d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367627/normal_5f91557f68161.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://sukifozupi.files.wordpress.com/2020/11/voruzosov.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/clasificacion_akin_insuficiencia_renal_aguda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5faf1eba-49c7-4ecc-9408-d3ce8305c296/codes_for_woodcutting_simulator_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/pujirageg/zugadekurojaxizes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3321ff24-464b-4bbc-bef2-b768eb6b7888/76995207917.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8A 5108 bytes
SHA-256: 66a156031bc6188db6ffc1c4086dbee7a9282f8c7f5e944b7265158127cc1702
font_01_sfnt_off00007009.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7009 10380 bytes
SHA-256: ccf0247bbfc6a73a662a3f80a31276a4e6f064dd4e79e56e824b29c16fa2d652